APHIS POMI PDF

The abdominal dorsum is pale and usually entirely membranous, although rarely a small sclerite or short bar may occur on the spine of tergite 5. The siphunculi and cauda are conspicuously blackish. The cauda has hairs rarely less than The body length of an adult aptera is 1.

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Description[ edit ] Wingless females have a pear-shaped bright green or yellowish-green body, undusted with wax particles, and grow to a maximum length of about 2. The cauda tail-like elongation of the body and cornicles are black and the antennae and legs are pale with brown tips.

Winged females have a black thorax and green abdomen, often with three pairs of blackish spots on the front three segments and dark semicircular spots in front of and behind the cornicles.

This has a wide range of host plants and a faster rate of reproduction than A. It is an autoecious species, completing its life cycle on a single host species. These aphids are all viviparous females and give birth to other wingless aphids by parthenogenesis. In June some winged females are produced and these migrate to other branches and trees, and large aggregations build up by late summer.

Mating takes place and eggs are laid near the tips of the shoots, sometimes in large batches. These are green at first but soon turn black. The presence of the ants is beneficial to the aphids as the ants deter and remove predators that might feed on the aphids; these include the larvae of the midge Aphidoletes aphidimyza and parasitoids which lay their eggs in the aphid nymphs.

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